Isaiah 63:4

For the day of vengeance is in mine heart, and the year of my redeemed is come.

The words are those of Christ Himself as the mighty Savior, glorious in apparel and traveling in the greatness of strength, coming from Edom with dyed garments from Bozrah, who speaks in righteousness and is mighty to save. His appointed time has come, with the day of vengeance in His heart and the year to redeem His people arrived. He trod the winepress alone with none of the people with Him and with none to help and none to uphold. He trod them in anger and trampled them in fury, so that their blood was sprinkled upon His garments and stained all His raiment, leaving Him red in apparel like one treading in the winefat.

The day of vengeance and the year of the redeemed belong together as one appointed time, with judgment against evil and deliverance for the redeemed joined in a single declaration. That appointed time came when He gave His own precious life, bearing individual sins and sorrows on the cross of Calvary where mercy and truth met together. By His own arm He brought salvation, purchasing all men and purchasing His church with His own blood as the ransom price, showing the high value placed upon man made in His image. That accomplishment means victory over the powers of hell has been proved true, the veil has been rent from top to bottom and a new and living way has been opened. The heathen world is no longer to be wrapped in darkness, midnight superstition is ended and gloom disappears before the bright beams of the Sun of Righteousness, and now all who will may reach forth the hand unto God and take hold of His strength and make peace with Him.

The verse also points to a final fulfillment after testing, for a time oppressors being permitted to triumph over His tempted and tried people who keep His holy commandments. While they triumph, everyone is tested and proved loyal or disloyal to the laws of heaven, with the same opportunity given to the first great rebel to show the spirit moving them. The delay allows Satan to the last to fully reveal his character as liar, accuser, and murderer, thereby completing the trial and showing the loyalty of God's people. It reflects the Lord's pity, compassion, and tender yearning for His tried people, His death at infinite price to ransom all, and His desire that none should perish but that all should believe for eternal life.

When that testing and revealing is complete, the verse is fulfilled in punishment of the oppressors that ends their triumph and in deliverance and redemption of His people. Their final triumph is thereby made more marked, more glorious, more full and complete. They are led to sing that the Lord reigns enthroned and exalted. The chapter to which the verse belongs speaks decisively to God's people and is to be understood as they stop their evil work and undergo reformation, repentance, and conversion.